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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bcb5323d7a1cdf0d7d74e37a5afffd1c222530841b92ca09d0848731ea42e7' 
  AND token = 'ztW7Kvj1wbm74oiHY6inuaqqfXxlmTIdZFgbq9XTZis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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