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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f9e270a25c1443a21d4a8a148e035b9608ce9a87d0ee18b96777fcff4999e4' 
  AND token = 'k6APtYVFA3UCRAeDm7k6gVTbh8oigIX2e5aAqJehb94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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