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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccc40a5d1777b9b7f311107fc8d623a224ef248eb1a0bcf9aff372c4a157429' 
  AND token = 'iu3K8Gz70BIpd1ctVM4bUmbIEfzy4XaK931DO2YhfEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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