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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0547b93ff187d831868dc216df91e179bdea1d3d2bd48ae7031bdfac30c023a9' 
  AND token = 'L7aKHtir2it3fl89FdYF05A0fWo+U6PRcf21c0PlEfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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