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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241d340573ab1470cb2281a9d896390ff24c03dbf3be541c1ec3b0159c9bd25b' 
  AND token = '39CKxds+2+c5nBTVQjGmdkKoosPcNcnvcID1PMytAiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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