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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb82e3ba099e1b773d3b4b689be676004680b7a1c2775faca0db599fae7d10a' 
  AND token = 'UE1BJmSdRAwEXueOYitLtyeqWYfcisAY1lkf4ala0lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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