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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef173787c2c7b4c282977c98c6760b1c1fb2d3d1d0274cd6c49c8b46f860a7b8' 
  AND token = 'Lq22QoIez/VnMkEeEzMJK9Xpn+b6ySu6Eui5eCF3Cfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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