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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c1a01862d9b71619b165358872ac3dc3bbb6e085fb3b25dd576e2f219d8373' 
  AND token = '0vlgodpZh74kokZF8za6MLaaBaOtcUV09lsa9JJAeuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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