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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e188ea98cb0083596b0b16bf0c13dcb0b2e44695e70ba0e5c38b7a72e1d35c' 
  AND token = '3MK2Ww+06dF1HhLY0C0uFMBWuZL6G9kJXQot6op6eC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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