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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf14a3ec6d6f1ba16a2a3ab57a65b259d3ef657e6eb6f2b6faec7294ebe2d1e' 
  AND token = 'RtU5vHbKK2Ps3Y0NoBykiBDcVai0yBg791dww0gAGEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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