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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da55a84e87a58c2dd10b184edfe829a1df95f7b3ce44d72646a98c7875a51fd0' 
  AND token = 'IR6ksRXtjCa5RhIGjMhE7QGncm0GkwK5H0H5kWoATO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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