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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86753d6a6151cbfc5519d04b67bc7863ca8c78efd9b81dd7d20fbd569b4d5ec2' 
  AND token = 'kbRT/V7I/xq06r6j9nzN6C6bYWSJ5c2HshFFmsuZnxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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