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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a35669a364b175a1a51cc043f68b02d56431af21511595160fc286a620d1ee' 
  AND token = 'wzYyiEmKXYN5wktz0884K9P/DTWCHAv98xGAz/yW41E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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