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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b303ac78a7d39f27326a6ef9d8fe5211f5b69b8cd51e0e896adf167488083d2' 
  AND token = 'jvQs9tH5QQ3u374fIXQz5zJJ+T6vDi27ruerrKxU7dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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