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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e399633d3eeb864e40f5627fa9e61afbffb8dd2237252652cb3c7b6a697d12' 
  AND token = 'ZlVFpo5IpkT94L0EZK8RkDc0kKpfQ8qsHGcDhJYtHSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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