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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff944c2be18d48ddde7f331e247112554a769ced974f574d7f83d71c0ca1e72c' 
  AND token = 'wDJqIWtF++eLXSXE5ti9UZuHNY6IOEt+9MQSjMxs5UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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