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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c86d58119d41043dcc2cf58ca540146ca1b6ab480e68c3f87bd81fa3aabdea7' 
  AND token = 's42VnbdFKwbx0Itll3dKiNsf7KB1HSmNb2Zu07sbpLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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