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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989ff6bdc31b5b21d2aca3c89a3b432fd549518939b31fd9e42967ea06a5e5b8' 
  AND token = 'U60ja/ksIKPaKpv1/ooq/M31sAufZy9CFfZvOAxKqMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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