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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c723c8f488559c6086530469a61c5f02adfb61f32d40a6c2cbde7ed55354b7fc' 
  AND token = 'ILCtCm1fexQQohJ0eFOqA7ZKmjyMyUmG3gQ7cF4ZUWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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