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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f32c36b5fda06e3ad7c98db78c8ac9778474d77c8f5f8bf292c24e3900a2fe' 
  AND token = '7PnFhWAU08BM/NBD8mLyzcYIUkPDhrZ6sR6wMcXwhbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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