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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0933dfe10175441c7688087e36e743ca107f5742640084341ea08ccb5e58104' 
  AND token = 'F/DB3Z/8NJSGOsT+n8T7eWvx6IYxZN3YtJjpRJCr/+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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