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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8e067ab7e7932289651e5c18bc18180d10c5a95a7968523cb77814cce1ae00' 
  AND token = 'sBa7bw6JZTnA1fgAlDXMNEfIsKxg4e5CLrrUsMtY8ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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