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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e232b15960766f245d1f568b63a5c946153f166ec90933d2ff7dd0ebae367386' 
  AND token = 'MpvOTFxSnTGp1C2TXzUFdN0s38Jkk6QxsfceOeqT4lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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