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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f228e1d839b572d106adf005e879efe4713e90f773c1ab6a5fc5cf08773bf090' 
  AND token = 'iD3cBzacd81NW1XafsqMY29XL/HYT8g8eSsK/NdjE/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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