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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660adbc0eaae7b41c1fe748e3ba58bd63d28eae7a3368a9b1dcb61b25b0a5416' 
  AND token = 'w5r48Cy6U28oNfeRmjOJc5BjL/0XljOfFgLeZ1Y807Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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