SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f464cfc1730fa8b29f5dc0c3d4197922c55dc32488fafab1c1acb0ba177183b' 
  AND token = 'zdh2aiLBrXVSJehuglgi6aX1uHimLE9mZG/GhlIrRKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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