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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a8967e2bc871e1ad24247a45135696a9213b36d4092f9aaf4c57b39b16d60d' 
  AND token = '9nsQU2LXV8kDoMleGKxltVC4KFeTdJwi0e5VpIReuBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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