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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971e35d4659ebd49d8bcaba76af857b74449e6cff8c5e72dd7121624b227ab5b' 
  AND token = 'BB3RSPvNQa22QPIVugL8rPkME3FK/xd8JRLG6k08dLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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