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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5d1c27f33e5af5239351e60e7f799ea82f24c5422dcabdd21f5c39785f8fb3' 
  AND token = 'rXA7IC4fIWWNVeGxS0Nn4nuL3JjQuaIhSYcG/ON4/2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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