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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42437f939a4f1c147c86a1853bb1bbb60a5003e6c3c636943437384e9a30ab83' 
  AND token = '/g5+k9OVGkYPQ1mB8/6tUYPy5L9zTZeymwnVfHmabSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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