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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da28b1ada50c1a08c38e225745c2d217021189824f9a8456b2f7da7faa0c6fda' 
  AND token = 'Rai2k2BAtYoHK6ad1NA9ZA6C1ThSZOjiS7KdeBqidm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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