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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f41d08c247d3479328f2d943d9c75de4715a1ca2617ec7473315c49fa01f37f' 
  AND token = 'WKCyRpel+spd7KX62HWNHawAqPoeyAViPs7+x2x9dN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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