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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bab436e83190f6df7b88219d3adaf9f54328dc8869e90944e5958f7c9abda97' 
  AND token = 'r4MCFJLoDWYOKEAQm2FrVFBux3/vx7ySiqc9e51cOcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}