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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d4f6c33ffe245a60ad5435319f058711132ce5a44e6085159ed36789edbc09' 
  AND token = 'gvRdo5E3uqXDTK/S3wjapqZ/Ohcdb03k3jnhkBN9KBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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