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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd22dda2bd4771a8bcb0e764213b4d2d360aa67d659379c7a7d1e08260faeebc' 
  AND token = 'KZxcNhm1eijzvsrKuaZDjc8WQbdowlb/3qCpdPNmxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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