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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7536c5c1c3464ddec5bd2e29c287c843c361a4ee38e4c25cbc7ccc29754d5f6' 
  AND token = '9pbytu6SYDt+YViNwKhIKCraeHHJLKmogWn/yg2ss2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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