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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a38021c71013e573fd89dfb01c6421d6bd040e56763755fe84f4e32286caa0' 
  AND token = 'ig1vjy8u7k20wrieTSWGIRa9pM5tsEZvLIolVebZC6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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