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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9655cce8ce24015a4c7ad89500c28ead597f409915b7828a40be5f48463bfa70' 
  AND token = '0TUcUpRwhRiO+4Hy6ps8IiQrH/dN5UMrcwknNmump+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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