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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb79533f8894edd578b7b04b8efa08d57bb88e7d413a187e58ef4a10d8c4893' 
  AND token = 'bppp0T5BlT4gyNApSlfAzQeb5DlplsI6bHsE7cFqTlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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