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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c41f69163103a65c94f922c69f8c449b17cb772c14efd69a7e234bf9ed9208' 
  AND token = 'psWmVrH0R+x6/t+fabMmi5ikCyP7haBws8dnPYJrYoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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