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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c1b39fb4447c183aac0b945c22221132b43f61bcbff7edb6dd18f1495b121e' 
  AND token = 'YnDMqOhBkRgHxEFgfhBH9gUfOGIViQ2f+8N8DsJuctQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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