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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6af1b9213f814ba0a53eecf736e144477cd795bf73849f3ac4f1d4810c3c90' 
  AND token = 'vjLD8/1KH1KTWU81oVvjld19ElK+Jsv/5vnb5cmUJf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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