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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b6d07208f876993bb4179b0d8bee550b110e9a84c67af0e2ba4b94cdac575' 
  AND token = 'goAY8PHUVEdZSCAg36N75G5Kfk7Hog2PVI9Unvwp8OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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