SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a143d3dd4745731c2365b80b58ce71d6e871369a61fab687eb35b147f2909155' 
  AND token = 'XPFUlGCMjaw8FfQRFmlDXbEIU5lRdO+cHLaghrVTrVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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