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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3867460f881a4f585c5b0344abf8b89d7bcb3aa7fe4f63dcca060255f7495d' 
  AND token = 'NsxlDNeugIs/8mkOGQ7NSqq6aofSD12NVKoj7RUiP4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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