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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f07fc7851a45f72912315937b1241214ba12a50daf17a69f86ad43626727a66' 
  AND token = 'ic0flOly5p65ZkJNNzENGK8T8Zc3g6WpVYC9RyB9/44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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