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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9988642932e2b8a2ebb184232655b018921b447b50e65118a2590815c480231' 
  AND token = '3rslc5iwQ0CIIFSiKbSrLlkkn/uU0qUM/EhtAuseI0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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