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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6420db12109783dd1a3f349a76f262b18834250dad4f225acc8c0a3226931198' 
  AND token = 'Rr825bDVDiaNeEXRhfPl3xavGcPM8iDhk+/ymWsoigg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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