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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3664be479bd463f4db9b749bbde5ac9b30e80eda0c66c0d3539ff67180d79b75' 
  AND token = 'Ap3fR01q0TySn8fHy/royJbncWcBMtxdvPkgMsH/ieg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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