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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662f765c589ef9355d34a99ac73216deb63db9b206ff812894a36044b387cee2' 
  AND token = 'sG1GR5hEE0T4BeWjvvn/WCe89u1b1WrdTTQve8VSPLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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